Sure thing! If the race is 20 minutes and each lap takes 2m04s, that means there will be 9.67 laps till the race is over, and you round that up to 10 since partial laps must be finished. You need 2.73 liters per lap, so the 10 laps will use 27.3 liters total. GPT-4 is correct in suggesting a tiny safety buffer above that in case fuel usage differs from expected.